[Jewelry making - Article 00483] - Re: [Orchid] Under karated caster

[James Binnion]

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June,


    Woops I guess I should finish my coffee before replying to email. I
    saw tester and assumed electronic not acid test. After reading Peter
    Rowe's excellent response about acid testing I realized my error.
    But even with an experienced operator the acid test is not precise
    enough to determine if your castings are of the correct karat . 

    The National Stamping Act only allows for a 3 parts per thousand
    deviation under karat on items that contain no solder, that is
    equivalent to .072 karat. You must get an assay from a lab to be
    sure if you have questions  as there is no other means to determine
    fineness accurately enough. This narrow margin of error is one
    reason why there is such a requirement for trust in our trade. An
    accusation of under karating should not be made lightly but if there
    is lab work to back it up then you need to have a heart to heart
    talk with your caster to figure out if it was an honest mistake or a
    pattern of behavior and then act accordingly. 

Jim Binnion
James Binnion Metal Arts
Phone (360) 756-6550
Toll Free (877) 408 7287
Fax (360) 756-2160
http://www.mokume-gane.com
jbin AT mokume-gane.com
Member of the Better Business Bureau

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